[Bug fortran/106817] clobber ordering problem when an actual intent(in) argument depends on the value of an intent(out) argument

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106817

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Mikael Morin
<mikael@gcc.gnu.org>:

https://gcc.gnu.org/g:fee1edea459ca655917f14605bdd38fe0e8f344e

commit r11-10300-gfee1edea459ca655917f14605bdd38fe0e8f344e
Author: Mikael Morin <mikael@gcc.gnu.org>
Date:   Sat Sep 3 11:58:47 2022 +0200

    fortran: Move clobbers after evaluation of all arguments [PR106817]

    For actual arguments whose dummy is INTENT(OUT), we used to generate
    clobbers on them at the same time we generated the argument reference
    for the function call.  This was wrong if for an argument coming
    later, the value expression was depending on the value of the just-
    clobbered argument, and we passed an undefined value in that case.

    With this change, clobbers are collected separatedly and appended
    to the procedure call preliminary code after all the arguments have been
    evaluated.

            PR fortran/106817

    gcc/fortran/ChangeLog:

            * trans-expr.c (gfc_conv_procedure_call): Collect all clobbers
            to their own separate block.  Append the block of clobbers to
            the procedure preliminary block after the argument evaluation
            codes for all the arguments.

    gcc/testsuite/ChangeLog:

            * gfortran.dg/intent_optimize_4.f90: New test.

    (cherry picked from commit 29919bf3b6449bafd02e795abbb1966e3990c1fc)